DEMON CITY SHINJUKU

Ten Years ago, Genichirou Izayoi died trying to stop the sorcerer Rebi Ra, and as a result Shinjuku became a playground for demons. And now, the day approaches when Rebi Ra will complete his decade-long ritual to plunge the rest of the world into chaos! As Genichirou's son, it falls to Kyouya to venture into the heart of Shinjuku and put an end to the sorcerer his father couldn't beat. Can Kyouya exceed his father's legacy, or will the demons of Shinjuku create Hell on Earth? (Source: Discotek) — Description from AniList community (anilist.co).